Not sure what size or thread pitch those bolts are, but if they are like the Pierce Motorsports bar, they are 1/2". Assuming they are grade 8 or better, coarse thread are rated to 80 lb/ft, fine are 90 lb/ft max. But you need to verify the grade of hardware, plain stainless bolts would only go to 43-45 lb/ft. And yeah, locktite and lock washers are your friends for those installs.